Drain plug



FIG. 1 is a top perspective view of a drain plug.

FIG. 2 is a bottom perspective view of a drain plug.

FIG. 3 is a top plan view of a drain plug.

FIG. 4 is a bottom plan view of a drain plug.

FIG. 5 is a side view of a drain plug.

FIG. 6 is a side view of a drain plug.

FIG. 7 is a side view of a drain plug; and,

FIG. 8 is a side view of a drain plug. 

CLAIM The ornamental design for a drain plug, as shown and described. 